1972-- FIRST SIMULATION OF PARALLEL HYPERTEXT WITH VISIBLE CONNECTIONS.
Parallel pages on the screen, with visible connections, is a central idea in my work. (We may call such pages "parallel hypertext"; Jason Scott has kindly suggested calling such pages "Nelson documents".)
(Included: PDF of the article with pictures; vertical picture as separate .jpeg.)
This 1972 article, with two photographs of a simulated interactive screen, is the first publication that made the idea of connected screen pages clear and explicit. The two photographs simulating connected pages are near the end of the document. (A third photograph was submitted but not included by the editors.)
(For a much more recent discussion of connected screen pages, see my YouTube video "Xanadu Basics 1a".)
This is the first publication that explicitly presented visible connection between parallel pages on a screen (though there were various hints in my previous work). It was published in the proceedings of the Online 72 conference at Brunel University in England, which I was unable to attend. (That conference was one of the first conferences about on-line interaction, possibly the first.)
SAME TEXT PUBLISHED EARLIER: The same text, entitled "As We Will Think", had already been distributed several years earlier, but without these photographs, which were made specifically for submission to the Online 72 conference.
EDITING ICON: The vertical illustration (also included separately) shows an interactive icon at the bottom. The icon, very hard to see, is the leftmost item under the right window of the vertical illustration. It is a lump crossed by a tilde symbol and with an X at the bottom; clicking the tilde would tell the system "rearrange", and the X would tell the system "delete".
HOW SIMULATED: The screen was simulated using white art materials on plastic in front of black paper, mounted above the keyboard of an IBM Selectric typewriter to simulate a computer with screen. (No such screens would become available for several more years.) The model is a very nice neighbor, Pat Crepeau.